2563666 has 8 divisors (see below), whose sum is σ = 4394880. Its totient is φ = 1098708.

The previous prime is 2563661. The next prime is 2563667. The reversal of 2563666 is 6663652.

2563666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2563661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91546 + ... + 91573.

It is an arithmetic number, because the mean of its divisors is an integer number (549360).

2^2563666 is an apocalyptic number.

2563666 is a deficient number, since it is larger than the sum of its proper divisors (1831214).

2563666 is a wasteful number, since it uses less digits than its factorization.

2563666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183128.

The product of its digits is 38880, while the sum is 34.

The square root of 2563666 is about 1601.1452151507. The cubic root of 2563666 is about 136.8633442950.

The spelling of 2563666 in words is "two million, five hundred sixty-three thousand, six hundred sixty-six".